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    // 1.toString()将我们的数组转换为字符串
    var arr = [1, 2, 3];
    console.log(arr.toString());  // 1,2,3

    // 2.join(分隔符)
    var arr1 = ['易烊千玺', '宋江', '车银优', '李易峰'];
    console.log(arr1.join()); // 易烊千玺，宋江，车银优，李易峰
    console.log(arr1.join('-')); // 易烊千玺-宋江-车银优-李易峰
    console.log(arr.join('&')); // 易烊千玺&宋江&车银优&李易峰
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